package com.hmdp.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;

@Component
public class RedisIdWorker {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;


    /**
     * 开始时间戳
     */
    private static final long beginTimestamp = 1640995200L;

    private static final int bitLength = 32;

    public long nextId(String keyPrefix) {
        // 生成时间戳
        LocalDateTime now = LocalDateTime.now();
        long epochSecond = now.toEpochSecond(ZoneOffset.UTC);
        long timestamp = epochSecond - beginTimestamp;

        // 生成序列号
        // 获取当前日期
        String date = now.format(DateTimeFormatter.ofPattern("yyyy:MM:dd"));
        long count = stringRedisTemplate.opsForValue().increment(RedisConstants.test + keyPrefix + ":" + date);

        return (timestamp << bitLength) | count;
    }
}
